Hectograph mass containing color intensifiers



Patented A r. 2, 1940 "UNITED sTATss 4 HEOTOGRAPH. MASS CONTAINING COLORINTEN SIFIERS William Hos kinl, Jr., Ia Grange, Ill., auignor to Ditto,Incorporated, Chicago, 111., a corpora tion West Virginia t No Drawing.Application January 81, 1938,

Serial No. 187,911

11 Claims.

The invention relates to the art of 'dupli-' eating. More-particularly,it relates to hectograph duplicating devices, hectograph duplicatingcompositions and to the reproduction of color de- 5 signs from suchduplicating devices and compositions.

An object of the invention is to provide an eflicient and inexpensivehectograph mass for duplicating purposes.

Another object is to provide a duplicating mass from which copies ofhigh color intensity may be prepared.

One form of the invention is a gelatinous duplicating mass of thehectograph type containing a salt of a hydroxy acid.

- The. gelatinous duplicating mass may suitably comprise an albuminoussubstance such as glue or gelatin, water, and a water soluble salt of ahydroxy acid, compatible with glue or gelatin,

such as sodium lactate, sodium oxy-butyrate, sodiuni citrate, andammonium lactate. Preferably, however, it will also contain a watersoluble high boiling liquid plasticizer such as glycerine or ethyleneglycol.

The proportion of solvent and plasticizer (glycerine, water and salt ofhydroxy acid) togbinder (glue or gelatin) may vary widely. Preferably,

however, the ratio of solvent and plasticizer to binder should be within5 to 20 times the weight of the binder. This ratio will give acommercially suitable hectograph blanket.

By way of illustration, several suitable formulae for hectographblankets are givenin the following table:

Example Ingredients 7 I II III a Porhby Pombr Pambi wet! weight weightas" it s a a Glycerine 250 an Sodium lactate 100 so 100 Invertsugar 80Dietbylcnc glycol.-. 250

Other suitable formulae are given in the following table:

(CI. 41-3L6) vIt will be understood that the above gelatinouscompositions may be adhered to a flexible backing-to form a duplicatingroll constituting another embodiment of this invention.

Copies of color designs may be made from the 5 compositions of thisinvention by carrying out the steps oi. the ordinary hectograph process.In this process a design formed of a soluble dye is applied to a sheetby writing, typing or the like. This sheet with the design is called themaster l0 copy. The design of the master copy is then con;

tacted with the duplicating mass, whereupon the dye of the design islargely transferred to the duplicating mass. Copies are then made bycontacting copy sheets with the design on the du- 16 plicat mass.

The vention makes it possible to produce a large number of color designsof high color intensity. As far as is known, the copies are muchbrighter than have hitherto been made by the 20 use of prior artgelatinous duplicating masses oi! ,similar desirable mechanical andweather resisting properties.

.Whiie there have been shown and described certain forms of thisinvention, it is to be under- 25 stood that it is capable of marrymodifications. Changes, therefore, in, the construction and arrangementmay be made without departing from the spirit and scope of the inventionas described in the appended claims, in which it is the inten- 30 tionto claim all novelty inherent in the invention as broadly as possible,in view of the prior art. i

In the claims the term gelatin is intended to include ordinary glue,sometimes called impure 35 gelatin, but which more strictly is adecomposition product resulting from the breakdown of gelatin moleciuesinto molecules of less molecular weight.

I claim: o-

1. A hectograph blanket oi! such shape and flexibility as to be capable,when secured to a flexible backing, of being wound into a rolland usedin a hectograph machine, said hectograph' blanket having incorporatedtherein a salt oi a 4 hydroxy acid as a color intensifier.

. 2. A hectogra ph blanket of such shape and flexibility as to becapable, when secured to a flexible backing, of being wound intoa rolland used in a hectographmachine, said hectographblanket comprising analbuminous substance and a water soluble salt oi! a hydron acid.

3. A hectograph blanket of such shape an flexibility as to be capable,when secured to a flexible backing, of beingwound into a roll and usedin a hectograph machine, said hectograph' blanket comprising gelatin.water, a polyhydroxy alcohol and a water soluble salt of a hydroxy acid.

4. A hectograph blanket of such shape and flexibility as to be capable,when secured to a flexible backing, oibeing wound into a roll and usedin a hectograph machine, said hectograph blanket comprising gelatin,water, glycerine and a water soluble salt of a hydroxy acid. I

5. A hectograph blanket of such shape and flexibility as to be capable,when secured to 9.

flexible backing, of being wmmd into a roll and to a gelatinousduplicating mass comprising gelatin, water, glycerlne and a salt oi! ahydroxy acid.

8. A duplicating roll comprising a backing in the form of a flexibleband, having secured thereto a gelatinous duplicating mass comprisinggelatin, water, glycerine and sodium lactate.

9. A duplicating roll comprising a backing in the form of a flexibleband, having secured there- 'to a gelatinous duplicating mass comprisinggela tin, water, glycerine and an alkali metal salt 0! a hydroxy acid.

10. A hectograph composition comprising gelatin, water and a plasticizerincluding diethylene glycol and a water soluble salt of a hydroxy acid,the amount of water and plasticizer to gelatln being withinapproximately flve to twenty times the weight of the gelatin.

11. A hectograph composition comprising the following ingredients in theweight proportions stated: gelafln, 30, water, 45, sodium lactate. 100,diethylene glycol, 250.

HOBKINS, J1.

